WASHINGTON — Ralph Nader could be poised for another third party presidential campaign.

The consumer advocate will appear on NBC's "Meet the Press" on Sunday. Nader launched his 2004 presidential run on the show.

A spokesman for Nader did not immediately return a call seeking comment.

Kevin Zeese, who was Nader's spokesman during the 2004 presidential race, but is no longer working for him, said Friday that Nader has been actively talking to "lots of people on all sorts of levels" about the possibility of making another run.

Zeese said he could only guess what Nader might do, but added: "Obviously, I don't think ("Meet the Press" host) Tim Russert would have him on for no reason."

Last month, Nader began an exploratory presidential campaign and launched a Web site that promises to fight "corporate greed, corporate power, corporate control."

Nader's appearance on "Meet the Press" was announced Friday in an e-mail message from Nader's exploratory campaign. The message from "The Nader Team" urges supporters to tell friends and family to watch the show and requests online contributions.